Dumping truck lift



June 29,1948. w, A KOSTlgg-K Re. 23,011

'DUMPING TRUCK LIFT :Ina/mr WALTER 'Af KOSTICK QW/wv M June 29, 194s. W; A; @STICK Re. 23,011

DUMP ING TRUCK LIFT Original Filed April 26, 1940 3 Sheets-Sheet, 2

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Flc, 3 d l JMW f WALTER A. KOSTICK June 29, 1948. w. A. Kos'rlcK DUMPING TRUCK LIFT 3 Sheets-Sheet 5 Original Filed April 26, 1940 l5 FIG.

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FIG. 6.

Reissued June 29, 1948 DUMPING TRUCK LIFT iNalter A. Kostick, Minneapolis, Minn.

Original No. 2,283,857, dated May 19, 1942, Serial No. 331,794, April 26, 1940. Application for reissue November 23, 1942, Serial No. 466,695

11 Claims. 1

My invention relates to a dumping truck lift and has for its object to provide and does provide an improved and highly eflicient' so-called dumping truck lift and, generally stated, consists of the novel devices, combinations of devices, and arrangement of parts hereinafter described and defined in the claims.

Particularly this invention relates to scale platforms that have supplemental sections or lifting platforms combined with cylinder-andpiston motors for lifting the latter. These cylinder and piston motors consist of a cylinder rigidly supported at its upper end from an open-ended bearing member, and having therein an openended sleeve in which is located a hollow piston rod with closed ends, compressed air introduced beneath the closed end of the piston rod causing the rod to rise within the sleeve until complementary members engage, when the sleeve will be picked u-p and moved with the rod, thus giving a telescoping extension which greatly reduces the depth of the pit below the lifting apparatus.

Still more specifically stated, the invention relates especially to scale platforms of the type just above outlined and wherein the cylinder and zzo-operating parts are located below and hung from the scale platform, so that all of such parts are carried as a part of the normal weight on the scale mechanism.

Hitherto dumping platform mechanism and actuating motors, arranged as above indicated, have been manufactured and extensively used, in an arrangement wherein the cylinder of the lifting motor was rigidly secured to and not capable of oscillatory movements in respect to the scale platform; but that arrangement has not been found completely satisfactory because certain actions take place in actual usage and which may be briefly stated as follows: When a dumpn ing truck is driven onto the scale platform, with its front wheels on the lifting platform, and the latter is then elevated, the weight on the rear wheels of the truck will tend to hold the rear truck wheels against forward travel. Under the lifting action the front wheels will be moved on the arc of a circle struck from the axis of the rear wheels, and this produces a backward pull on the lifting platform which is transmitted to the piston and produces an intense strain between the cylinder and the piston.

If the truck is one that has brakes and these brakes be set (and the brakes should be set), then the rearward pull on the lifting platform will be further increased. In either event, as the lifting platform is elevated and a lesser portion of the piston is within the cylinder, then this cramping action between the cylinder and piston will progressively increase with the result that terrific wear and sometimes breakage of the parts has been produced.

In accordance with my invention, I overcome the above noted objectionable actions by pivotally hanging the cylinder of the lifting motor on the scale platform structure, by means of an openf ended rigid bearing member pivotally connected with the platform structure, so that in the lifting action under rearward pull on the lifting platform, the entire cylinder and multi-section ltubular piston motor and the lifting platform will "i rock this pivoted bearing cylinder support. This feature, broadly stated, is, in practice, carried out in a novel way and involves various additional novel features, all of which will appear in the detailed description and the drawings.

To avoid the necessity of a very deep pit below the scale platform and the scale mechanism, I use with the pivotal cylinder support a relatively short cylinder and a multi-section piston. A vertically movable horse guard is desirable in a mechanism of this kind and I have been able to use a horse guard of the desired vertical length without making the pit deeper than required for the cylinder of the motor, and to do this, I have devised a novel means for operating the same, in which the horse guard is not picked up and carried with the lifting platform and piston until the piston has been given a considerable initial upward movement.

The invention embodying the novel features above' briefly outlined and various other highly important novel features is illustrated in the accompanying drawings wherein like characters indicate like parts throughout the several views.

Referring ,to the drawings:

Fig. 1 is a view chiefly in side elevation, with some parts sectioned, illustrating the improved dump and showing a dumping truck thereon;

Fig.` 2 is a vertical section taken approximately on the line 2-2 of Fig. 1;

Fig. 3 is a horizontal section taken approximately on the line 3-3 of Fig. 2, some parts being broken away;

Fig. 4 is a vertical section taken on the line of Fig. 2;

Fig. 5 is a fragmentary section taken on the line 5-5 0f Fig. 2;

Fig. 6 is a fragmentary section taken on the line 6--6 of Fig. 2; and

Fig. 'l is a fragmentary View in perspective showing a portion of the horse guard and guide therefore.

-In the drawings I have conventionally shown a fixed driving platform I having the customary Opening for the scale mechanism and below the same a pit Il. The scale .platform l2 is directly supported on metallic main beams I3 which,

through scal'eflevers I4 'or' the like',I are' carried by scale mechanism of welllknown or any suitable type. Near its front end there is formed transversely across the scale platform an opening.

Seated within this opening, and, when. ink itsvv lowered position, having its upper face approximately flush with or in the horizoritalfplane of? the top face of the scale platform. I2, islocated a lifting platform I5 which' constitutes assuppl'ee mental part of the complete scalefplatfo'rm adapted to act as a support for raising the forward end of a vehicle by contacting the front wheels l'thereof. This lifting platform I5 mainbeams I-iin: the samamanner that these beamsl'support the-rest: offthe scale platform, by engagement of the ends'of-liftinglplatformI5with the? topsr ofv main beams:` I 3:

The cylinder and piston motor, which I; have illustrated and Whichi's veryia'dvantageously used, is` mades. upy ofv a; cylinder.- IIi and a: multisection tubular' pistonA I"1-YI8C4 Thefouter pistonsection I-1fis"in"tlieform :of an-openended` tube` or; sleeve, wh'i-chtis'.' adapted" to'slide in an. floating mannerI Withirifthe depending-:cylinder for'predetermined distances* up'x and*` down'. 'Ilhe innen' pistorr1 secftioir` i8, thoughihollow or: cylindrical, isclosed at i beth ends, the.' lower. end"A forming the'.` piston facepropennto be' acted upon by? the compressedv f air; andthe upper' en'd carrying. aheadY on which therfs'upp'lemental" platform or lifting platform is mountedifori elevating.. the front endfof 'the truckv as the multiisection: piston IvJaI'S' by.'Y air pres'- suref-isprojected:upwardly. Ope'n-ended'tube or pistonfs'ection' I'T works directlywin the' cylinder I6: and! the pistoiasectionx I8? works' directly in the section Hi. The*- cy-linderf t5 depends fromy anioperr-'en'ded bearingfportion'- I9; Fig; 4, having aacylindrical innerisurfaceand being flanged at ift'sfv lippen'k endf and: bolted' or otherwise rigidly secured totransverse metallic 'channel' be'ams: 20 which, ati` their: ends,v are bolted'. or' otl'ierwiseV rigidly;4 secured tofspacingi; blocks'.A 24; see.: particu-,H la-rly Fig. 3: The extended ends of the crossI be'ams 2-.5 are further connected'l byr tie-bars' or beams 22, seeY Figstnvand'l, which; asf shown; are channel-shaped in cross section. Rigidly se-A curedto the blocks 2|, tothe'tie-'beams 22, and tofone ofthe crossbearns are-heavycylinder supporting-trunnions 23., the ends of which, as bestI shown in Figs. 2,- 3 and 6, arejournaled'in bearing. hubs` 2d. that, area part ofy or, at any rate, rigidly securedto the lower ends of hanger bracketsA 2.5. which, as shown, are. heavy channel beams. These hanger brackets 2.5 arerig.- idly secured to themainscale platformfbeams I 3 by suitable means, preferably by nut-equipped Hook' bolts 26', passed through-boltholesll,` and said brackets with the hooked endsof. the bolts' clinched" over the flanges of the respective beams |31' A` plurality of Tverticallyspaced bolt. holes 21 afford means 'for vertically adjusting the trunn'io'ns` 23,` andlience, the entirezlifting motor.

Tliecylinder" I6, by the meansjust described,` is mounted for oscillatory movements in the verticalinedal "longitudinal planelof the. scale `platform I2. To limit the oscillatory movement ofitlie cylinder; and hence oftlie" entirecy'linder" and is supported by the I piston motor, the cylinder is shown as provided with a long rearwardly projecting arm 28 that projects rearwardly from the upper portion of the cylinder and is further connected to the lower portio-n of the cylinder by an oblique trussbar 29. Here it should be noted that the axis of the pivot afforded by the trunnions 23 and hubs 2:41 is somewhat forward" of thefk axis of the cylinder so that there will befa somewhat preponderance of Weight on the front side of the trunnions which will tend to throw the arm 28 upward.-. To limit the upward movement of the arm 28 to a position in which the cylinder I6 wi-ll` be in a vertical position, a transverse stop barv Suis secured. toland extended between the main scale beamsL I3; see particularly Fig. 1.

Preferably the beam 3 is provided with a cushion block 3l of wood or other suitable material `with-'which the arm 2B is normally engaged. To limit the downward movement of the arm 28, andlnence. the .rocking movementof theicylinderand" piston fromfulmine-positions in Fig; L,

into l obl-iquey positions 1 indicated* by dotted?. lines in' said view, various ,kindsl of stop devices may Y be'emp-loyed, butifor' this purpose-l`I have shown:

a. sito-p1t rod-I 32 pivota'lly?E anchored.- to* the"-A scale" platform I2 by an eye-bolt-133'f' and at1its1=1ower= endl working-- freely 2througl'ixa sleeve-likehead'l34 at= the freeendfofsaidfarrn 28T.y At-'its extreme lower endftlie r'odf32i'ss'hown aswprovided'with arnuti 35er the lilie between whichand therfreef end of the arm Zilis' a coiledzspring` 3'65 Asy bestfshown n'Fig-LZ, the: cylinder I6?, at it'S lower end., is providedwith a-fheadl ISLl 'andthe cylinder `is braced A'against lateral swinging' move@ ment'szby' guy-'rozzlsl 3J;- the lowerendso'f which are attachedto projectionsfo'f s'aidhead |63', arid'. the upper; ends of which* are anchored tothe cross beams 2U'.

Normally, orA when the piston ofthe liftingmotor is contacted or lowered-to its eXtremeposi'- tion, the lifting platforn'lV section I5 Willi restupon-` extensions I 3&1 of# the 'blockslv 2 I'- and will be solelyY supported thereby. g

The piston-member I8, at its'l upper end; car-- riesf aiiexpanded frame or' piston-head--forniin'g` portion which,` as shown, includes transversely crossed-ILbeams 35 which, in turn, are welded'or otherwise rigidly secured to'a pair of' parallel wheelestop'flanges- 4:5", shownv as in* the' form of anglebars. The Iibeams 39, in this preferred structure', are welded orotherwiserigidly secured to a metalplat'e 39a that has aV rigidly attached heavyA trunni'on I8" that is telescoped into' the upper cnd' of the piston member' I; By this arrangement the inner piston-member lai is pro'- vide'd withadetachablel headl or cage-likeifting structure.v

The beams 3'!! areI normally considerably below and out-offcontact with Vthe lifting platform I 5, as

' st shown in-lligsL` 1, 2` and'l; andi ther stop' Iange'SU willbebelow thedevelj of the plat"-k form structure.` To limit the extreme' downward movement oflth'isv cagelilie head, and'h-ence,` of the; piston section I8; the'flanges 4U; at their ends; have projections'f- 40 that normally rest upon theupp'eranges ofthe' main scalebeams I3 andlimit the downward' movement'of' said head to lthe normalp`osition best 'shown in Figs; 2 and 4. In said'normal" position: the headfis" below and entirelyout' of' engagement with the. lifting'platfr'm I5.

lIn" this invention tlie-- usebof a multi"sec`tioi struction of such multi-section .piston motor may be varied in many ways.

'I'he horse guard is preferably a sheet metal plate 42 reinforced at its edges by light angle bars 42'. To the upper end portions of the angle bars 42 are welded or otherwise rigidly secured cylinder-like sleeves 43 in which work telescopically lifting rods or plungers 44, the upper ends of which are rigidly secured to the lower angles of the stop flanges 4B, see particularly Figs. 1 and 5. At their lower ends the lifting rods 44 have heads 45, which, when raised, engage caps 45 applied to the upper ends of the sleeve ends of the sleeve 43 and through which the rods 44 work telescopically. The flanges of the angle bars 42', at the edges of the horse guard 42, slide freely between laterally spaced guide pins 41 Welded or otherwise secured to the forwardly projecting ends of the tie-beams 22, see particularly Figs. 3 and 7.

In Fig; l, wherein the dumping truck is shown, the character a indicates the body, the character b the rear wheels, and the character c the front wheels thereof.

By reference particularly to Figs. 4 and '1, it

will be noted that the angle bars 42 of the horse guard 42 are provided with projecting stop lugs or lips 42a that normally rest on the stop flange of the beam 22 and limit the downward movement of said horse guard.

Also, it will be noted that the inner cylindrical piston I8 has an annular external shoulder Iila that is engageable with an annular internal shoulder Ha, on the cylindrical piston section I1, and that said piston section I1 has an external annular shoulder I1b that is engageable with an internal annular shoulder IBa on the cylinder I6. These shoulders cause the inner cylindrical piston I8 to pick up the cylindrical piston I1 so that the said piston sections will be extended in the Order named. Also, the shoulder I1b, when engaged with the shoulder' Ita, will limit the extreme expansion or upward movement of the piston.

Operation Assuming that the dumping truck or vehicle is driven on the scale platform I2 with its front wheels on the lifting platform I5 and that air or other motive fluid is introduced into the cylin der, the dump-producing operation will be as follows:

Following the introduction of com-pressed air the inner piston I8 will be moved upwardly. This initial upward movement will first cause the stop flanges 4I! to project above the lifting platform I5 to prevent the wheels from running off the said platform. Further upward movement of the piston will cause the cage-like head to engage the lifting platform I5, which is then mounted upon the upward end of the inner piston section I3. Continued upper movement of the inner piston section I8 will bring its annular external shoulder I8a into engagement with the annular internal shoulder I1a on the outer piston section I1, which will cause the outer piston section I1 to rise with the inner piston section I8 until the shoulder I1b engages the shoulder IEa on the cylinder IE which will stop upward movement. After the cagelike head has been moved above the scale platform I2, the rearward pull on the platform I5 and the pist0n head will cause the cylinder I6 and the .parts carried b-y the lifting platform to rock on the pivot 23, as indicated by dotted lines in Fig. 1. This rocking action entirely relieves all lateral `stop device.

strain between the cylinder and piston structure and prevents the truck from being drawn forward on its rear wheels. Under the above rocking movement of the cylinder and piston structure, arm 28 will be moved downward, as indicated by dotted lines in Fig. l, against the tension of spring 36. In fact, the tension of the spring 3Iiv is not such as to exert any considerable force tending to prevent rocking movement of the cylinder. The spring 3B might, in fact, be eliminated or made very short so as to simply act as a cushion at the limit of the downward movement of the arm 28 against the stop nut 35 or equivalent In fact, in some cases the stop mechanism for limiting the downward movement of the arm 28 might be omitted,

By reference particularly to Fig. 1, it will be noted that the pivot 23, that supports the cylinder IE, is far below the scale .platform I2 and that the said cylinder can not oscillate until the piston has been raised far enough to pick up the lifting platform I5 and carry the same and the flanges 40 well above the scale platform. This is important because the weight of arm 28 tends to produce the oscillation of the cylinder and furthermore in the lifting of the front end of the truck, and especially if the rear wheels be set, there is a further tendency to pull the lifting platform and piston backward. This rearward tilting movement of the piston and head and the oscillation of the cylinder will, of course, take place as soon as the lifting platform and the head of the piston are raised above the scale platform..

For a considerable part of the upward move-- ment of the piston, cage-like head and lifting platform I5, the horse guard will not be raised, but when the heads 45 of plungers 44 engage the caps 46 of the sleeves 43, as indicated by dotted lines in Fig. 5, then and thereafter under upward movement of the piston, cage-like head and lifting platform I5, the horse guard will be raised.

Obviously, when air is let out of the cylinder under proper control, the piston, lifting platform, and horse guard will, under an action reversed from that abovedescribed, be lowered and restored to normal positions. As already indicated, fthe horse guard will -be limited in its downward movement to a position in `which the lugs 42a engage the upper flanges of the beam 22. The above manner of lifting the horse guard and restoring it to normal position makes possible the use of a horse guard of the proper vertical length without bringing the horse guard into contact with the bottom of the pit or requiring a deeper pit therefor.

The manner in which a load will be dumped from they truck is too Well understood to require further comments. Usually there will be a pit adjacent to or sometimes partly under the scale platform, but that is a structure hitherto employed land not necessary for the purpose of this case to consider.

In accordance with the patent statutes I have described what is at present believed to be a preferred embodiment of the invention, but it will be understood that the structure illustrated in the drawings and specifically described is capable of a large range of modification all Within the scope of the invention herein disclosed and desired to be broadly claimed.

I claim:

1. The combination lwith a platform structure having an opening therein, and a lifting platform in said opening and normally seated to have its top flush with the top of said platform structure,

of: Whiting-motor involving1afcyliirlider'` and ipistonx; located; immediatelyl `below saidf liftingl platform; the cylinder thereof-1 being piyotallysupported' froml said platform structure;- acage-like 'head' applied.v to the upper? end S- of the-l pistonr of said i motori.A andi whenout of operation, being `positioned lcelow and out offsupportirigz"conta'ctr` with f said'wlifting, platform;` saldf.lifting-head havingk flanges'. thatl embrace 'r saidmlifting: platform :and Work f through ysalici opening and v' prevent oscilla tion; a ofv said vcylinder and I' piston sunt/il said head has1 engaged. said slitting l,platmrm' and movedto f apointabove said platform:therea'fterfpermitting oscillation of" said. motor.

2.`A The structuredefmedfintclaim in further combination with astopdevice -limitirigrzthe osci1 latoryc movement of ther-cylinder and* piston againstmovement@ inl one di'reotionfffrom lverticaliposition but permittingoscillationithereof when said: lifting-'head is raised as stated.- l

3: The structure dei-ined 'f in claim'l 1 in which.' said cylinder is `provided withv a rigidlyisecuredf arm.' projecting laterallyathereiirom; and"4 asto'pdevice 'on theplatformfstructiirelimiting the up Ward movement of saidiarm'but/ permitting.;the-v safid arnrto ylower torfprecluso#oscillationorsaidA cylinder and 1' piston.

4'. The combination a; platform havinga l supplementalsection forming'a; lifting platform normally seated therein Vwith .its top surf ace-'in the plane of the top surfaceof th'e platform lont'capa-v ble-'of being. bodily rali-sedaway-ffroml and alcove-y thetsameg: of-azcylindersandffpistonzliitingimotor; said cylin'derwb-eing pivotal-ly hung from said platform structure', the: piston of said` motor having a head-operativeto liftsaid supplementalfsection an'd permit the .sam-e and vsaidm'otorto oscillate. said@l cylinderhaving1r a rigidly secured'I laterally projecting arm; a-stop. onf said platform structure Ilimliting.- the'upward'` movermeritv ofi. said l arm but'. permitting ,downward 'movem'entl tl'iereoff.l

5': The combinationffwith rafplatform having. a supplementalsection' iormingaw lifting, Vplat-Form normally seated therein With'iitstolrivsinfaceinf thefplane of the-'top surfacefoftheffplatforrn fbut. 4. capableof being bodilyfrarisedf away from-wand above' the'same; of afoylindf'er 'andfpstcm` lifting" motor; said f cylinder being; pivotally: hungv from said: platform structure, the'pistonfof. said motor havin'g'a head 'operativeftoliit'said supplemental f section vand permit the-same fand rsaid; motor vto oscill-ate; said cylinder havingya:rigidlyxsecuredw laterally projecting arm, a stop on 'said platform: structure limiting the4l upward movement ofrsaidl :arm but permitting downward movement'th'eree r-ii:

of; and yieldingm'ea-nstending to' hold sadarm engaged with 'said` stop;

6. The'. combination with a platform' lhaving a"-r supplententa'l. section -fforming a .lifting'flplatform which when '1 outy ofope-ration is :seated with itse 5g;

movement 1' thereof andifyieldingimeans'tendlngitti;v

hold said arm engaged With'said:stopfandaistop rodhung from saidplatform structure-andliaving a lstop y'thereone limiting. the downwardmovefment of saidarm:

'7; The structure dened inclaimf'in which; afcoiledspring is linterposed on said1rodbetweenlr said arm and the stop on fsaid depending. rod;`

8.- The structure-defned-inI claim. 4 infwhich the lpivotal rconnection betweeny said'cylinderr andi"- platform structure is offsetfrom'the' axis :of `said?` cylinder inv ar directionv toward .which saidrearm :projects from :the cylinder.

9.: In a grain dump; a pneumatic: air actuated;` hoist, s-aid hoist embodyingyan lupwardly directedl open-ended hearing,x a cylinderv se'::ured-` to an'di dependingy from said= bearing; mea-nsf mcninting said bearing to permitffoscill'ation thereof-4 and- Ofi the depending cylinder; aA sleeve open atlooth'y ends iioatingly telescoped Within saidfcylindema piston with apistonrod mounted to slidetelescopically within saidsleeve, said sleeve andpis-itonrod adapted -to-slidewhen the cylinder isrinv' any of its oscillated positions, anda Wheel-v receiving. platform mounted on saidJ rod4 for hoisting frontI ends vof vehicles.l

10. Ina grain dump, a pneumatic air actuatedr hoist, said hoist embodying an upwardlyfdirected open-endedbearing,` a cylinder secured-.toand' depending from said bearing,` supporting means, for saidybearing including pivots offset-fromathe 'axial center thereof to permit oscillation thereot and of they depending cylinder, asleeveopen-ati both .ends iioatingly telescoped 2Within I said.v cylin'-` der, vra piston with a piston,rodmounteditoslide telescopioally within said sleeve, said sleeve-and piston rod adapted to slide-Whenfthecylinderis avnyfof its oscillated positions; andlahwl'leel-receiw-y ingplatform mounted'on saidrodwhenthe same is in operation for-hoisting front ends-v ofvehicle.

11. In a grain dump, .a pneumatic. air actuatedi hoist, said hoist embodyingfian upwardly. directed' open-endedl bearing, a cylinder seouredlto and?r depending from said bearing, meansH mounting,

said bearing to permit oscillation thereof" andr of the depending cylinder asleeve open at both ends iloati-ngly telescoped lwithin said cylinderg a piston with a piston rod lmounted .to slide telescopically Within 'saidsleeve .external means om the lower' part ofthe pistonlrovd` andv inter-nal meanson fthe upper part ofthe sleeveforcausingi.. them to move together after the piston rodhas;` been moved a predeterminedistance, external means on the lower. part ofthesleeve andinternal;v means on the upper part of fthe-cylinden to stop.,I movement of the sleeve andI piston rodWh'en-saidl movementY has reached a predetermined,entente and. a wheel-receiving. platform mounted lonusaid rodifor hoisting` front endsof vehicles.-`

WALTlER A,` KOSTICKQ.

REFERENCES C-ITED' Theffollowing references arepfrecord-iri the? file-of this patent:

Number Name Datei1 1,973,014 Oglesby Sept;Y 11;1934-:1 2,'25-35004' Win-ter' Auge 195,194r1vA 2,294,531I` Win-ter etali Sept:l l =1942`f`= 

